CN107359627A - Three-phase imbalance compensation device based on fuzzy PI hybrid control - Google Patents
Three-phase imbalance compensation device based on fuzzy PI hybrid control Download PDFInfo
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- CN107359627A CN107359627A CN201710516126.8A CN201710516126A CN107359627A CN 107359627 A CN107359627 A CN 107359627A CN 201710516126 A CN201710516126 A CN 201710516126A CN 107359627 A CN107359627 A CN 107359627A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention discloses the three-phase imbalance compensation device based on fuzzy PI hybrid control；Including positive sequence compensation network, negative sequence compensation network and control module；Positive sequence compensation network, inverter ac is surveyed into voltage source uc0(1)Pass through inverter equivalent resistance R and current-limiting reactor L and system side voltage source usIt is connected；Negative sequence compensation network, inverter ac is surveyed into voltage source uc0(2)It is connected with inverter equivalent resistance R and current-limiting reactor L；Using positive sequence control and negative phase-sequence control superposing control, positive sequence control usesThe control positive sequence control of electric current indirect method, negative phase-sequence control usePhase controls negative-sequence current and phase with modulation ratio, and wherein PI control modules are controlled using fuzzy rule with fuzzy reasoning module, realize reactive-load compensation and the three-phrase burden balance of power distribution network.
Description
Technical field
The invention belongs to technical field of circuit control, especially a kind of three-phase imbalance compensation dress based on fuzzy PI hybrid control
Put.
Background technology
As the nonlinear-loads such as modern power electronics devices largely access power network so that power distribution network three-phase load is uneven
Weighing apparatus；Three-phase load unbalance can cause that such as line voltage, current imbalance, voltage pulsation and flickering, power factor be low, circuit
Many harmful effects such as loss；The serious curtailment service life of equipment, will cause the power equipment can not normal work when serious
Make；A kind of three-phase imbalance intelligent compensation apparatus, including signal sampling list are disclosed in Application No. 201610634677.X
Member, central control unit, positive sequence negative sequence compensation unit, zero sequence compensation unit；It is characterized in that：Described signal sampling unit connects
Connect the voltage sampling unit and current sampling unit being connected on power network；Described signal sampling unit will be adopted from described voltage
The information that sample unit and current sampling unit sample is sent to described central control unit and carries out Treatment Analysis, in described
Centre control unit control is connected to the described positive sequence negative sequence compensation unit and zero sequence compensation unit in power network；Described positive sequence is born
Sequence compensating unit includes LCL filter and positive-negative sequence IGBT inverter bridges, described zero sequence compensation unit include zigzag transformer T and
Zero sequence IGBT inverter bridges, can effectively improve the electric energy loss caused by three-phase imbalance and equipment damage, in effective compensation power network
Existing zero-sequence current and negative-sequence current, the alternate transfer of forward-order current, make three-phase balance, although the invention can be realized quickly
The stability of regulation, but its is complicated, operation inconvenience is, it is necessary to consume electric energy to improve stability and reliability, therefore need
It is proposed that a kind of positive and negative sequence using fuzzy controller is superimposed compensating control method, realize Power Distribution Network Reactive Power Compensation and three
Phase load balances.Wherein, Fuzzy PI Controller combines the advantages of fuzzy control technology and PI controllers, can adjust PI in real time
Parameter, there is good dynamic property.
The content of the invention
Problem to be solved by this invention is to provide a kind of three-phase imbalance compensation device based on fuzzy PI hybrid control, uses
STATCOM is connected to the grid to compensate power distribution network three-phase load unbalance and reactive power, and STATCOM uses
Power Distribution Network Reactive Power Compensation is realized in the positive and negative sequence superposition compensating control method of fuzzy controller, positive sequence control, and negative phase-sequence control is in fact
Existing three-phase load unbalance, the advantages of Fuzzy PI Controller combines fuzzy control technology and PI controllers, it can adjust in real time
PI parameters, there is good dynamic property.
In order to solve the above technical problems, the technical solution adopted by the present invention is：Three-phase imbalance based on fuzzy PI hybrid control
Compensation device, including positive sequence compensation network, negative sequence compensation network and control module；
Positive sequence compensation network, inverter ac is surveyed into voltage source uc0(1)Pass through inverter equivalent resistance R and current-limiting reactor L
With system side voltage source usIt is connected, realizes Power Distribution Network Reactive Power Compensation；
Negative sequence compensation network, inverter ac is surveyed into voltage source uc0(2)With inverter equivalent resistance R and current-limiting reactor L phases
Even, three-phase load unbalance is realized；
Control module uses to be controlled first with reactive power Q using positive sequence control and negative phase-sequence control superposing control, positive sequenceC
Disturbed value, pass through fuzzy rule and reasoning module and PI controller modules produce θ1Control signal, utilize inverter ac
Survey fundamental voltage signal udc0Disturbed value, pass through fuzzy rule and reasoning module and PI controller modules produceControl letter
Number, useThe control positive sequence control of electric current indirect method；
Negative phase-sequence control surveys fundamental current i first with inverter acc0Disturbed value, pass through fuzzy rule and reasoning module
And PI controller modules produce θ2Control signal, extraction load current iLPhaseProduceControl signal, usePhase controls negative-sequence current and phase with modulation ratio, and wherein PI control modules are using fuzzy rule and fuzzy reasoning mould
Block is controlled, and realizes reactive-load compensation and the three-phrase burden balance of power distribution network.
The superposition compensation control of positive and negative sequence electric current, without increasing hardware cost, can effective compensation it is idle and maintain three-phase to bear
Lotus balances.
Fuzzy control model uses to be used using positive sequence control and negative phase-sequence control superposing control, positive sequence controlElectric current
Indirect method control positive sequence control, negative phase-sequence control usePhase controls negative-sequence current and phase with modulation ratio.
PI control modules are controlled using fuzzy rule with fuzzy reasoning module, and Fuzzy PI Controller combines Fuzzy Control
The advantages of technology processed and PI controllers, PI parameters can be adjusted in real time, there is good dynamic property.
The present invention uses STATCOM STATCOM (Static Synchronous Compensator), and it rings
Answer speed fast, stability is good, has good effect to the comprehensive above-mentioned power quality problem of solution.STATCOM adopts as main circuit
With related control strategies, to realize the compensation of three-phase imbalance load and reactive power.
STATCOM general principle is to be connected in parallel on bridge-type convertor circuit on power network by reactor, by suitably adjusting
The phase and amplitude of bridge-type convertor circuit AC output voltage, or the electric current for directly controlling its AC to export, make the circuit
The reactive current for meeting to require is absorbed or sends, so as to realize the purpose of three-phase imbalance load and dynamic passive compensation.
STATCOM compensating control methods are superimposed compensating control method using the positive and negative sequence of fuzzy controller, including positive sequence is mended
Repay network and negative sequence compensation network；Positive sequence compensation network, inverter ac is surveyed into voltage source uc0(1)Pass through inverter equivalent resistance R
With current-limiting reactor L and system side voltage source usIt is connected, realizes Power Distribution Network Reactive Power Compensation；Negative sequence compensation network, by inversion
Voltage source u is surveyed in device exchangec0(2)It is connected with inverter equivalent resistance R and current-limiting reactor L, realizes three-phase load unbalance；Control
Module uses to be used using positive sequence control and negative phase-sequence control superposing control, positive sequence controlElectric current indirect method controls positive sequence control
System, negative phase-sequence control usePhase controls negative-sequence current and phase with modulation ratio, and wherein PI control modules are using fuzzy rule
Then it is controlled with fuzzy reasoning module, realizes reactive-load compensation and the three-phrase burden balance of power distribution network.
Thinking, reasoning and the judgement of people is simulated in fuzzy control, can be avoided the concrete mathematical model of controlled device, be overcome system
The influence of non-linear factor, but it is poor to eliminate systematic steady state error ability, it is difficult to reach higher control accuracy.PI controllers
Algorithm is simple, control accuracy is high, and its autocatalytic reset action can theoretically make the steady-state error of system be zero.By fuzzy control
It is combined with PI controls, has both had the advantages that the strong adaptability of fuzzy control and flexibility ratio are high, has PI control accuracies high again
Feature.The realization of fuzzy control is broadly divided into 3 parts：Blurring, fuzzy rule and ambiguity solution.In order to improve power distribution network power
Factor is, it is necessary to compensate reactive power caused by load；Because negative-sequence current component is filled by STATCOM caused by uncompensated load
Put and be completely counterbalanced by, so reactive power of the compensating power corresponding to forward-order current is needed, using Current Indirect Control method
Carry out forward-order current control.Realize that the tracing compensation of reactive power and DC capacitor voltage keep constant.In order to eliminate injustice
Weigh negative-sequence current i caused by loadl(2), it is necessary to control negative-sequence current i corresponding to inverter generation0(2).By adjusting negative phase-sequence control
Corresponding phase and modulation ratio θ2To adjust the amplitude and phase that STATCOM produces negative-sequence current, it is completely counterbalanced by uneven negative
Negative-sequence current i caused by lotusl(2), positive sequence voltage modulated signal and negative sequence voltage modulated signal are superimposed rear defeated as STATCOM
Go out voltage modulation signal, PWM drive signal is produced after carried-based PWM and goes to control IGBT module, maintains DC bus capacitor electricity
Press constant, produce the reactive power and negative-sequence current of needs, realize reactive-load compensation and the three-phrase burden balance of power distribution network.
Brief description of the drawings
The invention will be further described below in conjunction with the accompanying drawings：
Fig. 1 is the system construction drawing of apparatus of the present invention；
Fig. 2 is the overall control principle drawing of apparatus of the present invention；
Fig. 3 is the variable membership degree function of apparatus of the present invention fuzzy control；
Fig. 4 is the positive sequence compensation network structure of the present invention；
Fig. 5 is the negative sequence compensation network structure of the present invention；
Fig. 6 is the detailed construction schematic diagram of positive-negative sequence of the present invention compensation control network.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
Accompanying drawing 1-6, the technical scheme of the embodiment of the present invention is clearly and completely described.Obviously, described embodiment is this
The part of the embodiment of invention, rather than whole embodiments.Based on described embodiments of the invention, the common skill in this area
The every other embodiment that art personnel are obtained, belongs to the scope of protection of the invention.
As shown in accompanying drawing 1-5, as one embodiment of the present of invention, STATCOM device main circuit uses PWM voltage source type
Converter, power network is accessed by current-limiting reactor.Positive and negative sequence compensation electric current superposition compensating control method is taken, respectively for electricity
Network reactive power and three-phase load unbalance compensate；Assuming that power supply is preferable three phase mains, load is that uneven three-phase is born
Lotus.10kV distribution systems are three-phase three-line system, because zero-sequence current does not have path, so using symmetrical component method to voltage
When being decomposed with electric current, positive-sequence component and negative sequence component are only existed, without zero-sequence component, compensation system only needs to compensate negative phase-sequence
Current component, so that it may so that power network three-phase balance.usa、usb、uscFor system voltage, isa、isb、iscFor system power,
STATCOM inverter ac side base wave voltages ula、ulb、ulc, load current ila、ilb、ilc, output current ia0、ib0、ic0, by base
You understand i by Hough current law (KCL)l=is+i0.In order to realize STATCOM while compensate power system reactive power and three-phase load
It is uneven, it is necessary to control STATCOM inverter ac side base wave voltage positive-sequence components, for producing corresponding forward-order current, control
Compensation system reactive power processed, the reactive power of STATCOM compensation areFor three-phase load unbalance system
System, mains side electric current can be decomposed, obtain forward-order current component and negative-sequence current component, pass through using symmetrical component method
STATCOM device compensates three-phase load unbalance so that grid side load is balance, it is necessary to control STATCOM to produce negative phase-sequence
Electric current, negative-sequence current caused by STATCOM device are
Positive sequence control ring and negative phase-sequence control ring superposing control are taken, wherein PI controls use fuzzy control, realize idle electricity
Compensated while stream and three-phase load unbalance, in order to improve Power Factor of Distribution Network, it is necessary to compensate idle work(caused by load
Rate；Because negative-sequence current component is completely counterbalanced by by STATCOM device caused by uncompensated load, compensating reactive power work(is needed
Rate is the reactive power corresponding to forward-order current.In order to eliminate negative-sequence current caused by uncompensated load, it is necessary to control inverter
Produce corresponding negative-sequence current.It is defeated as STATCOM after positive sequence voltage modulated signal and negative sequence voltage modulated signal are superimposed
Go out voltage modulation signal, PWM drive signal is produced after carried-based PWM and goes to control IGBT module, maintains DC bus capacitor electricity
Press constant, produce the reactive power and negative-sequence current of needs, realize reactive-load compensation and the three-phrase burden balance of power distribution network.
As shown in fig. 6, the further optimal enforcement mode as the present invention, this secondary design needs 3 fuzzy controllers,
It is separately employed in idle control ring, voltage control loop, current regulator, idle control ringRate of change is ec=de/
Dt, the fuzzy controller input of voltage control loop is e=Uref-Udc0, rate of change ec=de/dt, current regulator e=i0-
il, rate of change ec=de/dt.
For the ease of control, voltage control loop, current regulator, the input of idle control ring and the basic domain of output take
For [- 6,6]；The quantized factor and proportional factor of idle control ring input is respectively 0.018 and 0.5, the quantizing factor of ec inputs
It is respectively 2.4 × 10 with scale factor-8With 1；The quantized factor and proportional factor of voltage control loop input is respectively 0.03 He
The quantized factor and proportional factor of 0.5, ec input is respectively 7.5 × 10-10With 1.The quantizing factor and ratio of current regulator input
The example factor is respectively 0.015 and 0.5, and the quantized factor and proportional factor of ec inputs is respectively 8 × 10-10With 1.Then fuzzy control
Device input/output variable it is basic in the range of fuzzy set { -6, -4, -2,0,2,4,6 }, corresponding linguistic variable collection is combined into
{ negative big (NB), in bearing (NM), bear small (NS), zero (0), just small (PS), hit exactly (PM), honest (PB) }.Fuzzy rule is to carry out
The premise of fuzzy reasoning, a fuzzy rule is generally by " IF A, THEN B " two parts form, and A is the premise of fuzzy rule, B
It is the conclusion of fuzzy rule.Fuzzy control rule based on fuzzy reasoning table is IF e and ec THEN kp and IF e
and ec THEN kiConcrete meaning is：If e takes NB (negative big), ec to take NB (negative big), then kpTake PB (honest), kiTake NB (negative
Greatly)；Other situations are similar, altogether 49 rule.Inference method uses Mamdani methods.The result that fuzzy reasoning obtains is fuzzy
Value, it is impossible to be directly used in controlled device, it is necessary to first carry out defuzzification.Centre of area method (Centroid) is the most frequently used solution mould
Formulating method, using membership function mui0The fuzzy output electric current of expression, voltage, the idle controlled quentity controlled variable expression formula point after defuzzification
It is not
Centroid (I)=∫ μ0(i)idi/∫μ0(i) di, Centroid (U)=∫ μ0(u)udu/∫μ0(u) du,
Centroid (Q)=∫ μ0(Q)QdQ/∫μ0(Q)dQ
Finally illustrate, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, this area is common
Other modifications or equivalent substitution that technical staff is made to technical scheme, without departing from technical solution of the present invention
Spirit and scope, all should cover among scope of the presently claimed invention.
Claims (4)
1. the three-phase imbalance compensation device based on fuzzy PI hybrid control, including positive sequence compensation network, negative sequence compensation network and control
Module；
Positive sequence compensation network, inverter ac is surveyed into voltage source uc0(1)By inverter equivalent resistance R and current-limiting reactor L with being
Unite side voltage source usIt is connected, realizes Power Distribution Network Reactive Power Compensation；
Negative sequence compensation network, inverter ac is surveyed into voltage source uc0(2)It is connected with inverter equivalent resistance R and current-limiting reactor L,
Realize three-phase load unbalance；
Control module uses to be controlled first with reactive power Q using positive sequence control and negative phase-sequence control superposing control, positive sequenceCDisturb
Dynamic value, θ is produced by fuzzy rule and reasoning module and PI controller modules1Control signal, base is surveyed using inverter ac
Wave voltage signal udc0Disturbed value, pass through fuzzy rule and reasoning module and PI controller modules produceControl signal, adopt
WithThe control positive sequence control of electric current indirect method；
Negative phase-sequence control surveys fundamental current i first with inverter acc0Disturbed value, by fuzzy rule and reasoning module and
PI controller modules produce θ2Control signal, extraction load current iLPhaseProduceControl signal, usePhase
Position controls negative-sequence current and phase with modulation ratio, and wherein PI control modules are controlled using fuzzy rule with fuzzy reasoning module
System, realize reactive-load compensation and the three-phrase burden balance of power distribution network.
2. the three-phase imbalance compensation device based on fuzzy PI hybrid control as claimed in claim 1, it is characterised in that：Positive and negative sequence
Electric current superposition compensation control, without increasing hardware cost, can effective compensation it is idle and maintain three-phrase burden balance.
3. the three-phase imbalance compensation device based on fuzzy PI hybrid control as claimed in claim 2, it is characterised in that：Fuzzy control
Module uses to be used using positive sequence control and negative phase-sequence control superposing control, positive sequence controlElectric current indirect method controls positive sequence control
System, negative phase-sequence control usePhase controls negative-sequence current and phase with modulation ratio.
4. the three-phase imbalance compensation device based on fuzzy PI hybrid control as claimed in claim 3, it is characterised in that：PI is controlled
Module is controlled using fuzzy rule with fuzzy reasoning module, and Fuzzy PI Controller combines fuzzy control technology and PI controls
The advantages of device, PI parameters can be adjusted in real time, there is good dynamic property.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109256789A (en) * | 2018-10-23 | 2019-01-22 | 深圳供电局有限公司 | Three-phase unbalance adjusting device and current limiting method thereof |
| CN111181181A (en) * | 2020-01-19 | 2020-05-19 | 国网冀北电力有限公司电力科学研究院 | Three-phase unbalanced load regulation and control method of low-voltage power distribution network based on fuzzy PID control |
| CN113013873A (en) * | 2021-02-26 | 2021-06-22 | 云南电网有限责任公司保山供电局 | Novel power grid phase-locked loop self-adaptive compensation method and compensation system |
| CN113659587A (en) * | 2021-09-18 | 2021-11-16 | 广东电网有限责任公司 | Distribution network dynamic reactive power compensation method, device, equipment and computer medium |
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Application publication date: 20171117 |